To celebrate National Pet Day on Monday,NASA Astrophysicsdropped some heavenly creatures into itsNASAUniverse Twitter stream.

NASA Universe dedicated a threadto pets as co-workers.

Many folks who contribute to@NASAastrophysics have pets as coworkers.

Space names aren’t just for the fur-bearing crowd.

There’s an iguana called Event Horizon.

“Event Horizon is named for the surface of a black hole.

Event Horizon is named for the surface of a black hole.